(CNN) - For many girls in Afghanistan, the simple act of walking to school can be a life-threatening journey.

"You close the door behind you, and you enter a war zone," said Nushin Arbabzadah, an American-based author and scholar who was raised in Afghanistan.

There were at least 185 documented attacks on schools and hospitals in Afghanistan last year, according to the United Nations, and the majority of those attacks were attributed to armed groups opposed to educating females.

But "the walk from home to school is - and has always been - the most dangerous part," Arbabzadah said. "You are told to stay covered, keep your head down and walk quickly ... and stare at your toes."

"It is unfathomable that anyone would want to hurt them. But that is the reality," said Beth Murphy, a documentary filmmaker who recently traveled to Afghanistan to work on a feature film about girls' education.

Amid the violence, however, there is promise: In a country where just 6% of women 25 and older have received any formal education, millions of girls are at long last enrolling in school.

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